The Associated PressRepublican U.S. Sen. Scott Brown, left, and his Democratic rival Elizabeth Warren, right, have been actively campaigning across the commonwealth and through TV and radio ads in an attempt to sway voters in the Senate race which is being billed as the most expensive in history. (Associated Press file photos)

MARLBOROUGH, Mass. (AP) — Republican U.S. Sen. Scott Brown and Democratic challenger Elizabeth Warren both plan to take part in Monday's Labor Day parade in Marlborough.

The parade steps off at noon from the Marlborough Fire Station.

Warren's Monday schedule also includes remarks at the Central Massachusetts AFL-CIO Labor Day Breakfast in Worcester and the Greater Boston Labor Council Breakfast in Boston.

Warren has already won the endorsement of the AFL-CIO and other labor unions which traditionally back Democrats.